Magnus Viernickel authored Dec 18, 2022 and Sven Tennie committed Dec 26, 2022

- update nixpkgs
- provide a purely flake based interface to the ghc.nix tooling
- add ci for the new flake interface
- remove dependency on niv
- provide compatibility with legacy nix by the means of flake-compat
- move everything that was in default.nix into ghc.nix